The main dimensions of the tapered roller bearings comply with DIN ISO 355 and DIN 720. Dimensional and running tolerances correspond to tolerance school PN acc. to DIN 620. These tolerance classes are standard and are perfect for most applications.
The bearings are separable. This means the bearing parts could be fitted independently of each various other. The bearings are provided without seals. They may be lubricated with grease or essential oil from the side.
The rollers are processed to create pore-like micro indents in the top of steel (rolling contact area and roller head). This microstructure helps preserve an oil film that is perfect for tapered roller bearing applications. Improved oil film retention significantly inhibits surface damage, reaching more than eight times higher toughness and equal or higher seizure resistance compared to conventional products.
Better lubricant oil accumulation and retention (simpler to form oil film) in the roller surface contributes to 
10% lower friction for low speeds compared to conventional products.
Tapered roller bearings can accept huge radial and axial loads. Axial loads happen to be absorbed in only one way. For axial counter support a second bearing installed inverse is required. Ideal for medium speeds.
Bigger efficiency transmission systems are seen as key to increasing gasoline economy, so NSK set out to develop a great reliability bearing capable of overcoming these hurdles.
To improve fuel economy, there’s been a change to using less lubricant and/or reduced viscosity lubricant in transmission systems. Therefore, tapered roller bearings in transmissions will be being subject to increasingly severe lubrication circumstances, increasing the chance of lubrication oil film depletion (lean lubrication conditions), surface damage, and bearing seizure.